公开(公告)号：CA2357962C

公开(公告)日：2007-08-21

申请号：CA2357962

申请日：2001-09-28

Applicant: IBM ,  DASSAULT SYS OF AMERICA

Inventor： KLOSOWSKI JAMES T ,  SUITS FRANK ,  LECINA GERARD ,  VALUYEVA JULIA ANATOLYEVNA ,  HORN WILLIAM P

IPC: G06F17/50 ,  G06T15/00 ,  G06T17/00 ,  G06T17/20 ,  G06T17/40

Abstract: A system simplifies a geometric model to accelerate the rendering of the geometric model. A surface description of the geometric model is stored in one or more of the system memories. A wire-frame description of the geometric model is also stored. A surface simplification process alters the surface description to create an approximation of the original surface description. A wire-frame draping process drapes the wire-frame description onto the simplified surface and simplifies one or more of the line segments that are draped, the simplified line segments and the simplified surface description are rendered onto a display device.

公开(公告)号：JP2002197484A

公开(公告)日：2002-07-12

申请号：JP2001305951

申请日：2001-10-02

Applicant: IBM

Inventor： KLOSOWSKI JAMES T ,  SUITS FRANK ,  HORN WILLIAM P ,  LECINA GERARD

IPC: G06T15/00 ,  G06T15/04 ,  G06T19/00 ,  G09G5/36 ,  G06T17/40

Abstract: PROBLEM TO BE SOLVED: To provide improved system and method for draping, i.e., mapping optional annotation on a surface. SOLUTION: The vertex of the annotation is projected to the surface of a (2D or 3D) model and reconnected, and the original outer appearance of the annotation is maintained. The results of this method are a new set of geometric shapes of the annotation that geometrically follows the surface of the model. A plane is defined by the middle point of the original line segment and two projected vertexes. A new line segment following the plane is prepared by performing 'surface walk', e.g. along a line, defined by the intersections of the plane and the surface between the projected points by using the plane.

公开(公告)号：JP2002197127A

公开(公告)日：2002-07-12

申请号：JP2001312546

申请日：2001-10-10

Applicant: IBM

Inventor： SUITS FRANK ,  KLOSOWSKI JAMES T ,  HORN WILLIAM P ,  LECINA GERARD

IPC: G06F17/50 ,  G06T15/04 ,  G06T17/00 ,  G06T19/00 ,  G06T15/00

Abstract: PROBLEM TO BE SOLVED: To provide a geometrical annotation simplifying device, system and method. SOLUTION: A permissible range window perpendicular to a test side is defined by a first permissible range specifying the amount of a first error measured by a distance from a simplified route in a plane contacting with a surface to an original route, and a second permissible range specifying the amount of a second error measured by a distance from a simplified route in a plane perpendicular to the surface to the original route. By a point-projecting process, one or plural second end points of a second side are projected on the plane of the permissible range window. By an invalidating process, the side is marked as 'invalid' and removed. By a selecting process, one of the second end points having a projecting point in the plane including the permissible range window is selected, and a reference point is deleted. An origin is connected to each second end point, and a new side replacing each second side of the test side and an original side is created, thereby drawing a simplified route.

公开(公告)号：JP2002183228A

公开(公告)日：2002-06-28

申请号：JP2001312623

申请日：2001-10-10

Applicant: IBM

Inventor： HORN WILLIAM P ,  VALUYEVA JULIA ANATOLYEVNA ,  KLOSOWSKI JAMES T ,  SUITS FRANK ,  LECINA GERARD

IPC: G06F17/50 ,  G06T17/00 ,  G06T17/20 ,  G06T17/40

Abstract: PROBLEM TO BE SOLVED: To provide a method for using results obtained from a finite element analysis in order to guide surface simplification. SOLUTION: A system simplifies a geometric model in order to accelerate the rendering of a geometric mode. The surface description of the geometric model is stored in one or a plurality of system memories. The wire-frame description of the geometric model is also stored. The surface description is changed by a surface simplification process, and the approximation of the original surface description is prepared. The simplified surface is draped with the wire-frame description by a wire frame draping process, one or a plurality of draped line segments are simplified, and the simplified line segments and the simplified surface description are subjected to rendering to a display device.

公开(公告)号：CA2357962A1

公开(公告)日：2002-04-10

申请号：CA2357962

申请日：2001-09-28

Applicant: IBM

Inventor： SUITS FRANK ,  LECINA GERARD ,  KLOSOWSKI JAMES T ,  VALUYEVA JULIA ANATOLYEVNA ,  HORN WILLIAM P

IPC: G06F17/50 ,  G06T17/00 ,  G06T17/20 ,  G06T17/40 ,  G06T15/00

Abstract: A system simplifies a geometric model to accelerate the rendering of the geometric model. A surface description of the geometric model is stored in one or mor e of the system memories. A wire-frame description of the geometric model is also stored. A surface simplification process alters the surface description to create an approximation of the original surface description. A wire-frame draping process drapes the wire-frame description onto the simplified surface and simplifies one or more of the line segments that are draped, the simplified line segments and the simplified surface description are rendered onto a display device.

公开(公告)号：CA2357940A1

公开(公告)日：2002-04-10

申请号：CA2357940

申请日：2001-09-28

Applicant: IBM

Inventor： HORN WILLIAM P ,  KLOSOWSKI JAMES T ,  LECINA GERARD ,  SUITS FRANK

IPC: G06F17/50 ,  G06T15/04 ,  G06T17/00 ,  G06T19/00 ,  G06T15/00

Abstract: A computer system and method for simplifying annotations on a surface includ es a tolerance process creating a tolerance window lying in a plane and centered on the query point at the end of a test edge and perpendicular to the test edge. The tolerance window is defined by a first tolerance that specifies an amount of first error measured by the distance from a simplified path to an original path in the plane tangent to the surface, and a second tolerance that specifies an amount of second error measured by the distance from the simplified path to the original path in the plane perpendicular to the surface. The original path is a set of original edges on the surface. A point projection process that projects a second end point of one or more second edges onto the plane of the tolerance window. The second edges have the query poin t also as an end point where the projection of the second end points are projected points. An invalidation process marks an edge as "invalid" and removes it both from the list of simplifiable edges and the final list of simplified edges. A selection process selects one of the second end points that has a projected point within the plane containing the tolerance window, deletes th e query point, and connects the origin point to the respective second end point, to create anew edge that replaces the test edge and respective second edges in the set of original edges to create the simplified path.

公开(公告)号：CA2357971A1

公开(公告)日：2002-04-10

申请号：CA2357971

申请日：2001-09-28

Applicant: IBM

Inventor： HORN WILLIAM P ,  KLOSOWSKI JAMES T ,  LECINA GERARD ,  SUITS FRANK

IPC: G06T15/00 ,  G06T15/04 ,  G06T19/00 ,  G09G5/36 ,  G06T17/00

Abstract: Vertices of an annotation are projected onto a surface of a (2D or 3D) model and reconnected to preserve the original appearance of the annotation. The resul t of our method is a new set of geometry for the annotation that geometrically conforms to the surface of the model. A plane is defined by the midpoint of the original line segment and the two projected vertices. This plane is used to create the new line segments that conform to the surface, e.g. by doing a "surface walk" between the projected points along the line defined by the intersection of the plane and the surface.